Take-up mechanism for sewing-machines



(No Model.)

' P. T. LEILIGH.

TAKE-UP MECHANISM FOR SEWING MAGHINES.

Patented May 28,1889;

llllllllllllllill UNITED STATES PATENT OFFICE.

FRANCIS T. LEILICH, OF BRIDGEPORT, CONNECTICUT.

TAKE-UP MECHANISM FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 404,357, dated May 28, 1889. Application filed December 3, 1888, Serial No. 292,456. (No model.)

T0 at whom it may concern.-

Be it known that I, FRANCIS T. LEILICH, a citizen of the United States, residing at Bridgeport, in the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in Needle-Bar and Take- Up Mechanism for Sewin g-Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to certain novel and useful improvements in sewing-machines, but more particularly to those parts of such a machine as serve to impart to the needle-bar its vertical reciprocation in the head of the machine, and the take-up devices, also located in the head, and which serve to draw the loop of the thread tight in the fabric and thus form the stitch.

The objects of my invention are to provide such a needle-bar-driving mechanism as shall be exceedingly simple in its construction, economical in the use of lubricating material, capable of actuating the bar at a high rate of speed, and which shall impart to the said bar a variably-timed reciprocation, as will hereinafter be fully set forth, and, furthermore, in the construction of the take-up and the means whereby the latter is actuated;

and with these ends in view my invention consists in the details of construction and combination of elements hereinafter set forth, and then recited in the claims.

In order that those skilled in the art to which my invention appertains may more fully understand the construction and operation thereof, I will describe the same in detail, reference being had to the accompanying drawings, which form a part of this specification,and in which- Figure 1 is a partial vertical section through the head of a sewing machine, the disk whereby the power is applied to the moving parts being also sectional; Fig. 2, a front elevation with the face-plate removed, the takeup mechanism lying behind the disk being shown in dotted lines; Fig. 3, a horizontal section of the head, taken at line 00 0c of Fig. 2; and Fig. 4, a diagram showing the position of the needle-bar at each thirty degrees of rotation of the driving-disk.

Like reference-numerals denote the same parts in all the figures of the drawings.

While the devices herein described are adapted to be used in many types of machine, they are particularly designed to operate in the rotary-shuttle machines shown in my pending application, Serial No. 269,922, filed April 7 ,.1888, and in which is shown a complete machine embodying mechanism of substantially the construction herein set forth.

1 is the arm of the machine, and 2 the main shaft journaled in said arm.

3 is a disk secured upon the end of the main shaft within the head 4. In the outer face of this disk is cut a circular groove, 5, eccentric to the center of said disk.

6 is the needle-bar arranged in ways formed in the head of the machine, and 7 is a roller or stud upon the needle-bar. This stud enters the circular groove 5, and by means of this connection between the bar and disk the said needle-bar receives its vertical movement in its bearings.

Sis a profile cam-groove cut in the rear side of the disk 3, and this cam-groove actuates the take-up 9, which extends across the face of the head and is secured upon a short rock-shaft, 10, which latter has a bearing in the casting. which forms the head, as shown at Figs. 2 and 3. The actuation of the rockshaft and take-up is effected from this cam by means of the roller-stud 11, engaged by the groove thereof, the arm 12 on the rockshaft, the link 13 between the arm and the roller-stud, and the radius bar 14, one end whereof is pivotally secured to the roller-stud and the other end pivoted to the inside of the head.

\Vith relation to the driving of the needle bar, as shown in the drawings, I have found that a circular groove cut in the disk eccentrically to the center thereof is much better adapted to the driving of the said bar at high rates of speed than any other form of groove, since its frictional resistance is always constant, and in addition it possesses the following points of superiority; it does not throw dry of the lubricant and thus cut out; it runs quietly at very high rates of speed, and particularly in consequence of the peculiar and variable motion which it gives to the needle-bar the needle is raised very quickly,

throws out the loop promptly, and occupies a longer time in driving the needle through the upper half of its stroke than through its lower half, thus permittinga shorter stroke of the needle-bar, a corresponding diminution of vibration and friction, and a savin g of power.

Since the take-up is actuated positively from the groove at the rear side of the disk and the needle-bar driven by the groove at the front: side, the timing of the take-up and bar relative to each other is and must of necessity be perfectly secured.

The link, arm, and radius-bar connection impart the proper motion to the take-up very easily and wit-h little friction.

I claim- 1. The combination, with the main shaft and the disk, mounted upon the end thereof and carried thereby, and provided with acireular groove cut in the face thereof and having a cam-groove at its rear side, of the needle-bar supported in ways in the head and engaged and actuated by the circular groove, the take-up arm at the front of the head, the roek-shaft upon which said take-up is mounted, and the links, arm, and radius-bar operated by the cam atthe rear of the disk, whereby the sectoral throwis imparted to the take-up arm, substantially as specified.

2. The combinatiomwith the main shaft, of the disk mounted upon the forward extremity thereof, a circular groove cut in the outer face of said disk and eccentric as to its center with the center of the disk and engaging the neodle-bar, a cam-groove cut in the rear side of said disk, the take-up arm extending across the face of the head,the rock-shaft journaled in said head, upon which the take-up arm is mounted, and the rock-arm, radius-bar, links, and roller-stud, the latter engaged by the cam-groove, whereby the proper throw is imparted to the take-up, as set forth.

3. The combination, and the disk upon the end thereof, of the camgroove out in the rear side of said disk, the roller-stud 11, engaging said groove, the link 13, the radius-bar 14, and the rock-shaft having a short arm at one end pivotally secured to the link and having at the other end the take-up arm extending across the face of the head, substantially as described.

In testimony whereof I ai'fi x my signature in presence of two witnesses.

FRANCIS 'l. LEILIGH.

Witnesses:

S. II. HUBBARD, M. C. HINcHcLIrFE.

with the main shaft 

